Beginning of anger management (4)
I believe the answer is:
germ
'beginning' is the definition.
(germ is a kind of beginning)
'of anger management' is the wordplay.
'of' says the answer is hidden in the clue.
'GERM' is hidden in the letters of 'anger management'.
(Other definitions for germ that I've seen before include "Tiny organism that spreads disease" , "Disease-causing bacterium" , "From which disease comes" , "Minute life form" , "Cereal grain embryo" .)